package com.zhubayi.springcloud.lb;

import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;

import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;

/**
 * @author zhubayi
 */
@Component
public class MyLoadBalancerImpl implements MyLoadBalancer{
    private AtomicInteger atomicInteger=new AtomicInteger(0);
    private int incrementAndGetModulo() {
        int current;
        int next;
        do {
            current = this.atomicInteger.get();
            next =current>2147483647?0:current+1;
            //自旋锁
        } while(!this.atomicInteger.compareAndSet(current, next));
        System.out.println("第几次访问次数next:"+next);
        return next;
    }
    @Override
    public ServiceInstance instances(List<ServiceInstance> serviceInstances) {
        int index=incrementAndGetModulo()%serviceInstances.size();
        return serviceInstances.get(index);
    }

    public static void main(String[] args) {
        System.out.println(Short.MAX_VALUE);
    }
}
